X0206 3 2017-02-07 0 0001379895 DYNEGY INC. DYN 0001621292 ENERGY CAPITAL PARTNERS III, LLC 51 JOHN F. KENNEDY PARKWAY SUITE 200 SHORT HILLS NJ 07078 0 0 1 0 0001697506 Energy Capital Partners GP III, LP 51 JOHN F. KENNEDY PARKWAY SUITE 200 SHORT HILLS NJ 07078 0 0 1 0 0001594546 ENERGY CAPITAL PARTNERS III, LP 51 JOHN F. KENNEDY PARKWAY SUITE 200 SHORT HILLS NJ 07078 0 0 1 0 0001594549 ENERGY CAPITAL PARTNERS III-C, LP 51 JOHN F. KENNEDY PARKWAY SUITE 200 SHORT HILLS NJ 07078 0 0 1 0 0001697491 Energy Capital Partners III-B (Terawatt IP), LP 51 JOHN F. KENNEDY PARKWAY SUITE 200 SHORT HILLS NJ 07078 0 0 1 0 0001594547 ENERGY CAPITAL PARTNERS III-A, LP 51 JOHN F. KENNEDY PARKWAY SUITE 200 SHORT HILLS NJ 07078 0 0 1 0 0001697535 Terawatt Holdings GP, LLC 51 JOHN F. KENNEDY PARKWAY SUITE 200 SHORT HILLS NJ 07078 0 0 1 0 0001697533 Terawatt Holdings, LP 51 JOHN F. KENNEDY PARKWAY SUITE 200 SHORT HILLS NJ 07078 0 0 1 0 Common Stock 19541152 I See footnotes Terawatt Holdings, LP is the record holder of the securities reported herein. Energy Capital Partners III, LLC ("ECP GP") is the general partner of Energy Capital Partners GP III, LP ("ECP Fund GP"), which is the general partner of each of Energy Capital Partners III, LP, Energy Capital Partners III-A, Energy Capital Partners III-B (Terawatt IP), LP and Energy Capital Partners III-C, LP (collectively, the "ECP Funds"), which are the sole members of Terawatt Holdings GP, LLC ("Terawatt GP"), which is the general partner of Terawatt Holdings, LP. Douglas Kimmelman, Thomas Lane, Andrew Singer, Peter Labbat and Tyler Reeder are the managing members of, and Rahman D'Argenio is a partner of, ECP GP and share the power to vote and dispose of the securities beneficially owned by ECP GP. As such, each of Terawatt GP, the ECP Funds, ECP Fund GP, ECP GP and Messrs. Kimmelman, Lane, Singer, Labbat, Reeder and D'Argenio may be deemed to have or share beneficial ownership of the Common Stock held directly by Terawatt Holdings. Each such entity or individual disclaims any such beneficial ownership except to the extent of their pecuniary interest therein. Energy Capital Partners III, LLC, By: /s/ Christopher M. Leininger, Managing Director and Deputy General Counsel 2017-02-17 Energy Capital Partners GP III, LP, By: Energy Capital Partners III, LLC, its general partner, By: /s/ Christopher M. Leininger, Managing Director and Deputy General Counsel 2017-02-17 Energy Capital Partners III, LP, By: Energy Capital Partners GP III, LP, its general partner, By: Energy Capital Partners III, LLC, its general partner, By: /s/ Christopher M. Leininger, Managing Director and Deputy General Counsel 2017-02-17 Energy Capital Partners III-C, LP, By: Energy Capital Partners GP III, LP, its general partner, By: Energy Capital Partners III, LLC, its general partner, By: /s/ Christopher M. Leininger, Managing Director and Deputy General Counsel 2017-02-17 Energy Capital Partners III-B (Terawatt IP), LP, By: Energy Capital Partners GP III, LP, its general partner, By: Energy Capital Partners III, LLC, its general partner, By: /s/ Christopher M. Leininger, Managing Director and Deputy General Counsel 2017-02-17 Energy Capital Partners III-A, LP, By: Energy Capital Partners GP III, LP, its general partner, By: Energy Capital Partners III, LLC, its general partner, By: /s/ Christopher M. Leininger, Managing Director and Deputy General Counsel 2017-02-17 Terawatt Holdings GP, LLC, By: /s/ Tyler Reeder, President 2017-02-17 Terawatt Holdings, LP, By: Terawatt Holdings GP, LLC, its general partner, By: /s/ Tyler Reeder, President 2017-02-17